/**
 * @author (Jeff Thomas) 
 * @version (09.13.2007)
 */

public class Average
{
    public static void main(String[] args) {
        System.out.println(average3(15, 22, -1));
    }
    
    public static double average3(int a, int b, int c) {
        double average = (a + b + c) / 3;
        return average;
    }
}